Rust - Energy Monitor Bricklet¶

Simple¶

Download (example_simple.rs)

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use std::{error::Error, io};

use tinkerforge::{energy_monitor_bricklet::*, ip_connection::IpConnection};

const HOST: &str = "localhost";
const PORT: u16 = 4223;
const UID: &str = "XYZ"; // Change XYZ to the UID of your Energy Monitor Bricklet.

fn main() -> Result<(), Box<dyn Error>> {
    let ipcon = IpConnection::new(); // Create IP connection.
    let em = EnergyMonitorBricklet::new(UID, &ipcon); // Create device object.

    ipcon.connect((HOST, PORT)).recv()??; // Connect to brickd.
                                          // Don't use device before ipcon is connected.

    // Get current energy data.
    let energy_data = em.get_energy_data().recv()?;

    println!("Voltage: {} V", energy_data.voltage as f32 / 100.0);
    println!("Current: {} A", energy_data.current as f32 / 100.0);
    println!("Energy: {} Wh", energy_data.energy as f32 / 100.0);
    println!("Real Power: {} h", energy_data.real_power as f32 / 100.0);
    println!("Apparent Power: {} VA", energy_data.apparent_power as f32 / 100.0);
    println!("Reactive Power: {} var", energy_data.reactive_power as f32 / 100.0);
    println!("Power Factor: {}", energy_data.power_factor as f32 / 1000.0);
    println!("Frequency: {} Hz", energy_data.frequency as f32 / 100.0);

    println!("Press enter to exit.");
    let mut _input = String::new();
    io::stdin().read_line(&mut _input)?;
    ipcon.disconnect();
    Ok(())
}

Callback¶

Download (example_callback.rs)

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use std::{error::Error, io, thread};
use tinkerforge::{energy_monitor_bricklet::*, ip_connection::IpConnection};

const HOST: &str = "localhost";
const PORT: u16 = 4223;
const UID: &str = "XYZ"; // Change XYZ to the UID of your Energy Monitor Bricklet.

fn main() -> Result<(), Box<dyn Error>> {
    let ipcon = IpConnection::new(); // Create IP connection.
    let em = EnergyMonitorBricklet::new(UID, &ipcon); // Create device object.

    ipcon.connect((HOST, PORT)).recv()??; // Connect to brickd.
                                          // Don't use device before ipcon is connected.

    let energy_data_receiver = em.get_energy_data_callback_receiver();

    // Spawn thread to handle received callback messages.
    // This thread ends when the `em` object
    // is dropped, so there is no need for manual cleanup.
    thread::spawn(move || {
        for energy_data in energy_data_receiver {
            println!("Voltage: {} V", energy_data.voltage as f32 / 100.0);
            println!("Current: {} A", energy_data.current as f32 / 100.0);
            println!("Energy: {} Wh", energy_data.energy as f32 / 100.0);
            println!("Real Power: {} h", energy_data.real_power as f32 / 100.0);
            println!("Apparent Power: {} VA", energy_data.apparent_power as f32 / 100.0);
            println!("Reactive Power: {} var", energy_data.reactive_power as f32 / 100.0);
            println!("Power Factor: {}", energy_data.power_factor as f32 / 1000.0);
            println!("Frequency: {} Hz", energy_data.frequency as f32 / 100.0);
            println!();
        }
    });

    // Set period for energy data callback to 1s (1000ms).
    em.set_energy_data_callback_configuration(1000, false);

    println!("Press enter to exit.");
    let mut _input = String::new();
    io::stdin().read_line(&mut _input)?;
    ipcon.disconnect();
    Ok(())
}

Basic Functions¶

pub fn EnergyMonitorBricklet::new(uid: &str, ip_connection: &IpConnection) → EnergyMonitorBricklet¶

Parameters:	uid – Type: &str ip_connection – Type: &IPConnection
Returns:	energy_monitor – Type: EnergyMonitorBricklet

Creates a new EnergyMonitorBricklet object with the unique device ID uid and adds it to the IPConnection ip_connection:

let energy_monitor = EnergyMonitorBricklet::new("YOUR_DEVICE_UID", &ip_connection);

This device object can be used after the IP connection has been connected.

pub fn EnergyMonitorBricklet::get_energy_data(&self) → ConvertingReceiver<EnergyData>¶

Return Object:

voltage – Type: i32, Unit: 1/100 V, Range: [-231 to 231 - 1] current – Type: i32, Unit: 1/100 A, Range: [-231 to 231 - 1] energy – Type: i32, Unit: 1/100 Wh, Range: [-231 to 231 - 1] real_power – Type: i32, Unit: 1/100 W, Range: [-231 to 231 - 1] apparent_power – Type: i32, Unit: 1/100 VA, Range: [-231 to 231 - 1] reactive_power – Type: i32, Unit: 1/100 var, Range: [-231 to 231 - 1] power_factor – Type: u16, Unit: 1/1000, Range: [0 to 216 - 1] frequency – Type: u16, Unit: 1/100 Hz, Range: [0 to 216 - 1]

Returns all of the measurements that are done by the Energy Monitor Bricklet.

• Voltage RMS
• Current RMS
• Energy (integrated over time)
• Real Power
• Apparent Power
• Reactive Power
• Power Factor
• Frequency (AC Frequency of the mains voltage)

The frequency is recalculated every 6 seconds.

All other values are integrated over 10 zero-crossings of the voltage sine wave. With a standard AC mains voltage frequency of 50Hz this results in a 5 measurements per second (or an integration time of 200ms per measurement).

If no voltage transformer is connected, the Bricklet will use the current waveform to calculate the frequency and it will use an integration time of 10 zero-crossings of the current waveform.

pub fn EnergyMonitorBricklet::reset_energy(&self) → ConvertingReceiver<()>¶

Sets the energy value (see EnergyMonitorBricklet::get_energy_data) back to 0Wh.

pub fn EnergyMonitorBricklet::get_waveform(&self) → Result<Vec<i16>, BrickletRecvTimeoutError>¶

Returns:	waveform – Type: [i16; 1536], Range: [-215 to 215 - 1]

Returns a snapshot of the voltage and current waveform. The values in the returned array alternate between voltage and current. The data from one getter call contains 768 data points for voltage and current, which correspond to about 3 full sine waves.

The voltage is given with a resolution of 100mV and the current is given with a resolution of 10mA.

This data is meant to be used for a non-realtime graphical representation of the voltage and current waveforms.

pub fn EnergyMonitorBricklet::get_transformer_status(&self) → ConvertingReceiver<TransformerStatus>¶

Return Object:	voltage_transformer_connected – Type: bool current_transformer_connected – Type: bool

Returns true if a voltage/current transformer is connected to the Bricklet.

pub fn EnergyMonitorBricklet::set_transformer_calibration(&self, voltage_ratio: u16, current_ratio: u16, phase_shift: i16) → ConvertingReceiver<()>¶

Parameters:	voltage_ratio – Type: u16, Range: [0 to 216 - 1], Default: 1923 current_ratio – Type: u16, Range: [0 to 216 - 1], Default: 3000 phase_shift – Type: i16, Range: [0], Default: 0

Sets the transformer ratio for the voltage and current transformer in 1/100 form.

Example: If your mains voltage is 230V, you use 9V voltage transformer and a 1V:30A current clamp your voltage ratio is 230/9 = 25.56 and your current ratio is 30/1 = 30.

In this case you have to set the values 2556 and 3000 for voltage ratio and current ratio.

The calibration is saved in non-volatile memory, you only have to set it once.

Set the phase shift to 0. It is for future use and currently not supported by the Bricklet.

pub fn EnergyMonitorBricklet::get_transformer_calibration(&self) → ConvertingReceiver<TransformerCalibration>¶

Return Object:	voltage_ratio – Type: u16, Range: [0 to 216 - 1], Default: 1923 current_ratio – Type: u16, Range: [0 to 216 - 1], Default: 3000 phase_shift – Type: i16, Range: [0], Default: 0

Returns the transformer calibration as set by EnergyMonitorBricklet::set_transformer_calibration.

pub fn EnergyMonitorBricklet::calibrate_offset(&self) → ConvertingReceiver<()>¶

Calling this function will start an offset calibration. The offset calibration will integrate the voltage and current waveform over a longer time period to find the 0 transition point in the sine wave.

The Bricklet comes with a factory-calibrated offset value, you should not have to call this function.

If you want to re-calibrate the offset we recommend that you connect a load that has a smooth sinusoidal voltage and current waveform. Alternatively you can also short both inputs.

The calibration is saved in non-volatile memory, you only have to set it once.

Advanced Functions¶

pub fn EnergyMonitorBricklet::get_spitfp_error_count(&self) → ConvertingReceiver<SpitfpErrorCount>¶

Return Object:	error_count_ack_checksum – Type: u32, Range: [0 to 232 - 1] error_count_message_checksum – Type: u32, Range: [0 to 232 - 1] error_count_frame – Type: u32, Range: [0 to 232 - 1] error_count_overflow – Type: u32, Range: [0 to 232 - 1]

Returns the error count for the communication between Brick and Bricklet.

The errors are divided into

• ACK checksum errors,
• message checksum errors,
• framing errors and
• overflow errors.

The errors counts are for errors that occur on the Bricklet side. All Bricks have a similar function that returns the errors on the Brick side.

pub fn EnergyMonitorBricklet::set_status_led_config(&self, config: u8) → ConvertingReceiver<()>¶

Parameters:	config – Type: u8, Range: See constants, Default: 3

Sets the status LED configuration. By default the LED shows communication traffic between Brick and Bricklet, it flickers once for every 10 received data packets.

You can also turn the LED permanently on/off or show a heartbeat.

If the Bricklet is in bootloader mode, the LED is will show heartbeat by default.

The following constants are available for this function:

For config:

• ENERGY_MONITOR_BRICKLET_STATUS_LED_CONFIG_OFF = 0
• ENERGY_MONITOR_BRICKLET_STATUS_LED_CONFIG_ON = 1
• ENERGY_MONITOR_BRICKLET_STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
• ENERGY_MONITOR_BRICKLET_STATUS_LED_CONFIG_SHOW_STATUS = 3

pub fn EnergyMonitorBricklet::get_status_led_config(&self) → ConvertingReceiver<u8>¶

Returns:	config – Type: u8, Range: See constants, Default: 3

Returns the configuration as set by EnergyMonitorBricklet::set_status_led_config

The following constants are available for this function:

For config:

• ENERGY_MONITOR_BRICKLET_STATUS_LED_CONFIG_OFF = 0
• ENERGY_MONITOR_BRICKLET_STATUS_LED_CONFIG_ON = 1
• ENERGY_MONITOR_BRICKLET_STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
• ENERGY_MONITOR_BRICKLET_STATUS_LED_CONFIG_SHOW_STATUS = 3

pub fn EnergyMonitorBricklet::get_chip_temperature(&self) → ConvertingReceiver<i16>¶

Returns:	temperature – Type: i16, Unit: 1 °C, Range: [-215 to 215 - 1]

Returns the temperature as measured inside the microcontroller. The value returned is not the ambient temperature!

The temperature is only proportional to the real temperature and it has bad accuracy. Practically it is only useful as an indicator for temperature changes.

pub fn EnergyMonitorBricklet::reset(&self) → ConvertingReceiver<()>¶

Calling this function will reset the Bricklet. All configurations will be lost.

After a reset you have to create new device objects, calling functions on the existing ones will result in undefined behavior!

pub fn EnergyMonitorBricklet::get_identity(&self) → ConvertingReceiver<Identity>¶

Return Object:

uid – Type: String, Length: up to 8 connected_uid – Type: String, Length: up to 8 position – Type: char, Range: ['a' to 'h', 'z'] hardware_version – Type: [u8; 3] 0: major – Type: u8, Range: [0 to 255] 1: minor – Type: u8, Range: [0 to 255] 2: revision – Type: u8, Range: [0 to 255] firmware_version – Type: [u8; 3] 0: major – Type: u8, Range: [0 to 255] 1: minor – Type: u8, Range: [0 to 255] 2: revision – Type: u8, Range: [0 to 255] device_identifier – Type: u16, Range: [0 to 216 - 1]

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c', 'd', 'e', 'f', 'g' or 'h' (Bricklet Port). A Bricklet connected to an Isolator Bricklet is always at position 'z'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

Callback Configuration Functions¶

pub fn EnergyMonitorBricklet::set_energy_data_callback_configuration(&self, period: u32, value_has_to_change: bool) → ConvertingReceiver<()>¶

Parameters:	period – Type: u32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false

The period is the period with which the EnergyMonitorBricklet::get_energy_data_callback_receiver callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

pub fn EnergyMonitorBricklet::get_energy_data_callback_configuration(&self) → ConvertingReceiver<EnergyDataCallbackConfiguration>¶

Return Object:	period – Type: u32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false

Returns the callback configuration as set by EnergyMonitorBricklet::set_energy_data_callback_configuration.

Callbacks¶

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done with the corresponding get_*_callback_receiver function, which returns a receiver for callback events.

pub fn EnergyMonitorBricklet::get_energy_data_callback_receiver(&self) → ConvertingCallbackReceiver<EnergyDataEvent>¶

Event Object:

voltage – Type: i32, Unit: 1/100 V, Range: [-231 to 231 - 1] current – Type: i32, Unit: 1/100 A, Range: [-231 to 231 - 1] energy – Type: i32, Unit: 1/100 Wh, Range: [-231 to 231 - 1] real_power – Type: i32, Unit: 1/100 W, Range: [-231 to 231 - 1] apparent_power – Type: i32, Unit: 1/100 VA, Range: [-231 to 231 - 1] reactive_power – Type: i32, Unit: 1/100 var, Range: [-231 to 231 - 1] power_factor – Type: u16, Unit: 1/1000, Range: [0 to 216 - 1] frequency – Type: u16, Unit: 1/100 Hz, Range: [0 to 216 - 1]

Receivers created with this function receive Energy Data events.

This callback is triggered periodically according to the configuration set by EnergyMonitorBricklet::set_energy_data_callback_configuration.

The members of the received struct are the same as EnergyMonitorBricklet::get_energy_data.

Virtual Functions¶

Virtual functions don't communicate with the device itself, but operate only on the API bindings device object. They can be called without the corresponding IP Connection object being connected.

pub fn EnergyMonitorBricklet::get_api_version(&self) → [u8; 3]¶

Return Object:	api_version – Type: [u8; 3] 0: major – Type: u8, Range: [0 to 255] 1: minor – Type: u8, Range: [0 to 255] 2: revision – Type: u8, Range: [0 to 255]

Returns the version of the API definition implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

pub fn EnergyMonitorBricklet::get_response_expected(&mut self, function_id: u8) → bool¶

Parameters:	function_id – Type: u8, Range: See constants
Returns:	response_expected – Type: bool

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For callback configuration functions it is enabled by default too, but can be disabled by EnergyMonitorBricklet::set_response_expected. For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For function_id:

• ENERGY_MONITOR_BRICKLET_FUNCTION_RESET_ENERGY = 2
• ENERGY_MONITOR_BRICKLET_FUNCTION_SET_TRANSFORMER_CALIBRATION = 5
• ENERGY_MONITOR_BRICKLET_FUNCTION_CALIBRATE_OFFSET = 7
• ENERGY_MONITOR_BRICKLET_FUNCTION_SET_ENERGY_DATA_CALLBACK_CONFIGURATION = 8
• ENERGY_MONITOR_BRICKLET_FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
• ENERGY_MONITOR_BRICKLET_FUNCTION_SET_STATUS_LED_CONFIG = 239
• ENERGY_MONITOR_BRICKLET_FUNCTION_RESET = 243
• ENERGY_MONITOR_BRICKLET_FUNCTION_WRITE_UID = 248

pub fn EnergyMonitorBricklet::set_response_expected(&mut self, function_id: u8, response_expected: bool) → ()¶

Parameters:	function_id – Type: u8, Range: See constants response_expected – Type: bool

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and callback configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For function_id:

• ENERGY_MONITOR_BRICKLET_FUNCTION_RESET_ENERGY = 2
• ENERGY_MONITOR_BRICKLET_FUNCTION_SET_TRANSFORMER_CALIBRATION = 5
• ENERGY_MONITOR_BRICKLET_FUNCTION_CALIBRATE_OFFSET = 7
• ENERGY_MONITOR_BRICKLET_FUNCTION_SET_ENERGY_DATA_CALLBACK_CONFIGURATION = 8
• ENERGY_MONITOR_BRICKLET_FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
• ENERGY_MONITOR_BRICKLET_FUNCTION_SET_STATUS_LED_CONFIG = 239
• ENERGY_MONITOR_BRICKLET_FUNCTION_RESET = 243
• ENERGY_MONITOR_BRICKLET_FUNCTION_WRITE_UID = 248

pub fn EnergyMonitorBricklet::set_response_expected_all(&mut self, response_expected: bool) → ()¶

Parameters:	response_expected – Type: bool

Changes the response expected flag for all setter and callback configuration functions of this device at once.

Internal Functions¶

Internal functions are used for maintenance tasks such as flashing a new firmware of changing the UID of a Bricklet. These task should be performed using Brick Viewer instead of using the internal functions directly.

pub fn EnergyMonitorBricklet::set_bootloader_mode(&self, mode: u8) → ConvertingReceiver<u8>¶

Parameters:	mode – Type: u8, Range: See constants
Returns:	status – Type: u8, Range: See constants

Sets the bootloader mode and returns the status after the requested mode change was instigated.

You can change from bootloader mode to firmware mode and vice versa. A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

The following constants are available for this function:

For mode:

• ENERGY_MONITOR_BRICKLET_BOOTLOADER_MODE_BOOTLOADER = 0
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_MODE_FIRMWARE = 1
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4

For status:

• ENERGY_MONITOR_BRICKLET_BOOTLOADER_STATUS_OK = 0
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_STATUS_INVALID_MODE = 1
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_STATUS_NO_CHANGE = 2
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_STATUS_CRC_MISMATCH = 5

pub fn EnergyMonitorBricklet::get_bootloader_mode(&self) → ConvertingReceiver<u8>¶

Returns:	mode – Type: u8, Range: See constants

Returns the current bootloader mode, see EnergyMonitorBricklet::set_bootloader_mode.

The following constants are available for this function:

For mode:

• ENERGY_MONITOR_BRICKLET_BOOTLOADER_MODE_BOOTLOADER = 0
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_MODE_FIRMWARE = 1
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
• ENERGY_MONITOR_BRICKLET_BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4

pub fn EnergyMonitorBricklet::set_write_firmware_pointer(&self, pointer: u32) → ConvertingReceiver<()>¶

Parameters:	pointer – Type: u32, Unit: 1 B, Range: [0 to 232 - 1]

Sets the firmware pointer for EnergyMonitorBricklet::write_firmware. The pointer has to be increased by chunks of size 64. The data is written to flash every 4 chunks (which equals to one page of size 256).

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

pub fn EnergyMonitorBricklet::write_firmware(&self, data: [u8; 64]) → ConvertingReceiver<u8>¶

Parameters:	data – Type: [u8; 64], Range: [0 to 255]
Returns:	status – Type: u8, Range: [0 to 255]

Writes 64 Bytes of firmware at the position as written by EnergyMonitorBricklet::set_write_firmware_pointer before. The firmware is written to flash every 4 chunks.

You can only write firmware in bootloader mode.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

pub fn EnergyMonitorBricklet::write_uid(&self, uid: u32) → ConvertingReceiver<()>¶

Parameters:	uid – Type: u32, Range: [0 to 232 - 1]

Writes a new UID into flash. If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first.

We recommend that you use Brick Viewer to change the UID.

pub fn EnergyMonitorBricklet::read_uid(&self) → ConvertingReceiver<u32>¶

Returns:	uid – Type: u32, Range: [0 to 232 - 1]

Returns the current UID as an integer. Encode as Base58 to get the usual string version.

Constants¶

pub const EnergyMonitorBricklet::DEVICE_IDENTIFIER¶

This constant is used to identify a Energy Monitor Bricklet.

The EnergyMonitorBricklet::get_identity function and the IpConnection::get_enumerate_callback_receiver callback of the IP Connection have a device_identifier parameter to specify the Brick's or Bricklet's type.

pub const EnergyMonitorBricklet::DEVICE_DISPLAY_NAME¶

This constant represents the human readable name of a Energy Monitor Bricklet.